Larry Krasner sworn in as Philadelphia District Attorney. Vernon Odom reports during Action News at 4pm on January 2, 2018.

For FOP President John McNesby who was never a big fan of Larry Krasner, he had the following to say about today's shakeup.

"It's shocking number one, and it's kind of scary for what it says is going to happen to the court system over the next 6 or 7 months," McNesby said.

Former prosecutor Richard Sax, who was out of town and served 37 years in the D.A.'s office, 30 of them in the homicide unit was devastated. He says there was only one thing those who were fired had going against them.

"They won their cases, they prevailed. They achieved justice for the victims. That's what that they did, they did their job," Sax said.

He says as bad as he feels for the 31 who were fired, he feels worse for the city.

"I feel worse for the city of Philadelphia because I think that the citizens are really truly going to suffer," Sax added.

But former city councilwoman Marian Tasco begs to differ.

"I wouldn't say it's a purge," she said.

Tasco says Krasner has every right to put in people he believes will carry out his agenda.

"He wants the staff to be more engaged and certainly pay attention to the cases that come, and just not be ready to send somebody to jail."

It remains unclear how soon Krasner will replace the fired prosecutors and staffers or for that matter, how this will impact each unit's caseload.

Krasner has been a critic of what he calls mass incarceration. He vows to not pursue death sentences and backs the idea of safe injection sites for heroin users.

He would also like to see the use of cash bail scaled back and eventually eliminated.

The police union and the Fraternal Order of Police have criticized Krasner as being soft on crime and hostile toward police.

Krasner's election came just months after Seth Williams resigned following his corruption conviction.